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System Fund and reimbursables - Summary of System Fund and Reimbursable Revenues and Expenses (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
System Fund And Reimbursables [Line Items]      
System Fund expenses $ (1,763) $ (1,694) $ (1,545)
Reimbursable expenses (1,004) (1,000) (896)
System Fund and reimbursable expenses (2,767) (2,694) (2,441)
System Fund And Reimbursable Revenues      
System Fund And Reimbursables [Line Items]      
Revenue 2,721 2,611 2,460
System Fund Revenue      
System Fund And Reimbursables [Line Items]      
Revenue 1,717 1,611 1,564
Reimbursable Revenues      
System Fund And Reimbursables [Line Items]      
Revenue $ 1,004 $ 1,000 $ 896